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#1 2021-10-18 21:16:20

JanBlokes
Member
From: Ostrava
Registered: 2018-09-06
Posts: 26

Element types supported with CALC_FATIGUE

Hello everyone,

where I could find what element types are supported with CALC_FATIGUE, please? I am especially interested for shell elements but I am affraid they are not supported.

Thank you very much for any hint,
Jan

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#2 2021-10-19 18:24:10

J_Berthellemy
Member
From: Champs-sur-Marne
Registered: 2009-04-29
Posts: 70

Re: Element types supported with CALC_FATIGUE

I am also afraid shells are not supported.
I agree this is a major handicap !


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#3 2021-10-20 19:05:55

miib
Member
Registered: 2021-03-23
Posts: 98

Re: Element types supported with CALC_FATIGUE

sorry in advance : i'm a beginner with code aste :-D

i'm curious : how do you resolve the effect of 3D geometry using shell elements ???

:-)


Attachments:
CM_3b_Fattori di concentrazione delle tensioni_2019.pdf, Size: 800.11 KiB, Downloads: 37

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#4 2021-10-20 21:53:51

JanBlokes
Member
From: Ostrava
Registered: 2018-09-06
Posts: 26

Re: Element types supported with CALC_FATIGUE

miib wrote:

sorry in advance : i'm a beginner with code aste :-D

i'm curious : how do you resolve the effect of 3D geometry using shell elements ???

:-)

Hello,

I'm not sure if I understand your question. You can use shell elements when two dimensions are bigger than third. For example plate during tensile test.

Jan

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#5 2021-10-22 14:42:52

J_Berthellemy
Member
From: Champs-sur-Marne
Registered: 2009-04-29
Posts: 70

Re: Element types supported with CALC_FATIGUE

miib wrote:

sorry in advance : i'm a beginner with code aste :-D

i'm curious : how do you resolve the effect of 3D geometry using shell elements ???

:-)

If we could use shell elements, instead of volumic elements everywhere,
the models would be much more small ans easier to calculate !
Volumic elements are actually necessary only at the fatigue hotpoint.

I there is a way to mixt volumic elements and shells in CALC-FATIGUE, I will be very happy
then this  would reduce the size of my problems by about 10.

Cordialement


https://www.researchgate.net/profile/Jacques_Berthellemy
Ubuntu 18.04 LTS  64 bits 15,7 Gio  8 CPU et/ou Red-Hat 250 Gio 57 CPU

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#6 2021-10-22 18:48:06

miib
Member
Registered: 2021-03-23
Posts: 98

Re: Element types supported with CALC_FATIGUE

J_Berthellemy wrote:
miib wrote:

sorry in advance : i'm a beginner with code aste :-D

i'm curious : how do you resolve the effect of 3D geometry using shell elements ???

:-)

If we could use shell elements, instead of volumic elements everywhere,
the models would be much more small ans easier to calculate !
Volumic elements are actually necessary only at the fatigue hotpoint.

I there is a way to mixt volumic elements and shells in CALC-FATIGUE, I will be very happy
then this  would reduce the size of my problems by about 10.

Cordialement

thank you in advance :-)

"your" is the commercial software approach, do you know that in code aster the reduction of the computation's weight is possible using 3D elements  with out loose Kt (for example) factor?

:-)

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#7 2021-10-23 06:17:15

miib
Member
Registered: 2021-03-23
Posts: 98

Re: Element types supported with CALC_FATIGUE

attached , example 1 :-)

Last edited by miib (2021-10-23 06:18:24)


Attachments:
all_fine.jpeg, Size: 307.9 KiB, Downloads: 36

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#8 2021-10-23 06:19:24

miib
Member
Registered: 2021-03-23
Posts: 98

Re: Element types supported with CALC_FATIGUE

attached, example 2 :-)


Attachments:
local_fine.jpeg, Size: 166.09 KiB, Downloads: 39

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#9 2021-10-25 15:40:53

J_Berthellemy
Member
From: Champs-sur-Marne
Registered: 2009-04-29
Posts: 70

Re: Element types supported with CALC_FATIGUE

Bonjour,

exemple : vue générale d'un platelage de pont


Attachments:
Ortho_3D modele_global.jpg, Size: 244.1 KiB, Downloads: 18

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#10 2021-10-25 15:43:05

J_Berthellemy
Member
From: Champs-sur-Marne
Registered: 2009-04-29
Posts: 70

Re: Element types supported with CALC_FATIGUE

Detail of the weld


Attachments:
Ortho_3D modele_soudure.jpg, Size: 343.09 KiB, Downloads: 22

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#11 2021-10-25 15:46:23

J_Berthellemy
Member
From: Champs-sur-Marne
Registered: 2009-04-29
Posts: 70

Re: Element types supported with CALC_FATIGUE

Hi

I also try to make appear the principal forces ( lignes isostatiques ).
To see if the fatigue is mono or multiaxial.
Do you know how to do ?


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#12 2021-10-25 16:13:16

JanBlokes
Member
From: Ostrava
Registered: 2018-09-06
Posts: 26

Re: Element types supported with CALC_FATIGUE

J_Berthellemy wrote:

Hi

I also try to make appear the principal forces ( lignes isostatiques ).
To see if the fatigue is mono or multiaxial.
Do you know how to do ?

Hello,

the discussion about displaying principal stresses is here https:/\www.salome-platform.org/forum/forum_10/859084413
In the end of the discussion are also links with useful macros for Paraview smile

Hope this helps.
Jan

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#13 2021-10-26 10:29:37

J_Berthellemy
Member
From: Champs-sur-Marne
Registered: 2009-04-29
Posts: 70

Re: Element types supported with CALC_FATIGUE

Bonjour,

Oui merci beaucoup.
Pour les développeurs, j'insiste sur le fait que ce sont les éléments sur lesquels on ne cherche pas à faire de calcul de fatigue car ce ne sont pas des points chauds, à modéliser en volumique,
soit avec la hot spot method,
soit avec la effective notch stress method, ...
qu'on souhaiterait pouvoir modéliser le reste de la structure avec des coques.

Cordialement.


https://www.researchgate.net/profile/Jacques_Berthellemy
Ubuntu 18.04 LTS  64 bits 15,7 Gio  8 CPU et/ou Red-Hat 250 Gio 57 CPU

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#14 2021-11-03 21:30:16

Ect
Member
From: Switzerland
Registered: 2008-05-15
Posts: 103

Re: Element types supported with CALC_FATIGUE

Juste en passant,
Avez-vous essayé de modéliser en coque, sauf la zone d'intérêt, et utiliser LIAISON_MAIL avec le type de raccord COQUE_MASSIF ? Le calcul de dommage peut ensuite être effectué uniquement sur un groupe de mailles volumiques, en tout cas cette approche fonctionne en présence d'éléments discrets, ça devrait probablement être le cas aussi en présence de coques.
Bon courage,
Ect

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